Problem with frames

I am starting to use Dreamweaver 4 to create a website for the 1st time.

I create 3 frames for a title bar, navigation and a main page.

When I create the frames I then save them all as a frameset called index.htm

When I shut down dreamweaver and open this frameset again for editing, I can no longer drag the frames to resize them, the grey line that you drag is not there, just dotted lines which show the edges of the frames in the frameset.

Can anyone help??

Thanks

Attached is a screenshot

Try with select from the main menu

View >>> Visual Aids >>> Frame Borders.

Bye,
Milaus

I love you